Lung exercise device



FIG. 1 is a front elevation of a lung exercise device showing our newdesign.

FIG. 2 is a rear elevation thereof.

FIG. 3 is a side elevation thereof.

FIG. 4 is a top plan thereof and also is a mirror image of the bottomthereof; and

FIG. 5 is an elevation as seen from the side opposite FIG. 3.

The ornamental design for a lung exercise device, substantially as shownand described.